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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94ff6c6d1e775d0ef2ceaaf0e5fcf3a640df9b5774ad326d0bf6d1cd0dfe3a47' 
  AND token = 'zJrxAj9BdGo6ZTflOIV50fez4hjQ08dUXPj8pOkqEu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}